Compressed-air spraying and coating machine.



R. M. JOHNSTON. COMPRESSED AIR SPRAYINGAND COATING MAGHINE.

APPLIGATION IjILED r33. e, 1906, I

Patented May 11. 1909.

' Mata/{oz UNITED STATESTPATENT OFFICE.

ROBERT M. JOHNSTON, OFMANSFIELD, OHIO, ASSIGNOR TO THE HUMPHREY MANUFAC- TURING COMPANY, OF MANSFIELD, OHIO, A CORPORATION OF OHIO.

COMPRESSED-AIR SPRAYING AND COATING MACHINE.

Specification of Letters Patent.

Patented May 11, 1909.

" b all wliom it may concern:

Be it known that 1, ROBERT M. Jorms'ror, a citizen of the United States of America, and a resident of the city of lwlansfield; Bichland county, Ohio, have invented certaln new and useful Improvements in Compressed -Air Spraying and Coating Machines, of which the following is a. specification.

My invention relates to an apparatus for J .-ayi1ig coating or applying paint, whitewash or other fluids and fine solids to surfaces by the force of compressed air.

combine a plurality of tanks or reservoirs or wall A similar partition or wall ((5) is provided and spaced apart from the wall forming an air chamber (7) communicating with the inlet air ducts (8).

The outlet aperture (9) of the chamber is 3 and pump and secured to the pipes 10--10 with an air pump in such a manner as to f permit the operation of the machine by one man.

A further feature of my invention is the means employed of securing blades or paddles within and in close proximity to the bottom of the tank to agitate and com- A further object is the application of spring-actuated puppet valves to the air pump by means of which greater efficiency of air compression is obtained.

My invention comprises the following elements, a compound air pump, an air tank and a liquid or fluid tank operated in conjunction with each other for the purpose of spraying and coating surfaces.

I attain these and other objects by the mechanism illustrated by the accompanying drawing in which- Figure 1 is a side elevation and plan view of the air and liquid tanks and air pump showing relative position of the paddle or bladed agitator in dotted line, also pipe connections and appliances. Fig. 2, is a dia grammatic sectional view of the air pump taken on the line X X of Fig. 1, showing the detail of the elongated plunger and arrangement of the puppet valves.

Similar characters of reference refer to similar parts throughout the several views.

In the construction of my device I provide a standard (1) shown in dotted lines. The base (2) of the air pump is formed conical in shape with the end terminating in an outward extending annular flange which is secured to the base (1). The upper end of the base is threaded to fit the outer periphery of the pump cylinder (4) leaving the end resting on the partition top of the wall.

. to prevent the air from flowing back into One of the objects of my invention is to l the chamber when the pump is not in use.

An aperture is provided in the upper wall having a tapered valve seat surrounding said aperture and formed in the A similar tapered valve seat (13) surrounds a similar aperture formed in the wall (5) but is disposed on the bottom of the wall. The seats (12) and f (13) are formed on the wall 011 a plane mingle the fluid or liquid contained therein. 1

with each other but disposed upon the top and bottom as shown. A valve (1%) having a stem (14) depending into the chamber is fitted to contact with the seat (12).

The stem (14L) is surrounded by a coil spring (15) and held under compression by the collar (16) which forces the valve in contact with the seat. A valve (13 similar to the valve (12 is fitted to the valve seat with the stem (17) depending therefrom into the chamber alining with an aperture provided in the center of a circular standard (18) which is secured to the partition wall (6) directly underneath the valve seat (13). A coil spring (19) surrounds the valve stem (17), and is compressed between the collar formed by the valve and stem and the face of the standard exerting a tension against the valve and forcing in contact with the seat (13). It will be observed that both valves are seated under spring tension. )Vhen the plunger (20) is reciprocated in the cylinder (4), the upstroke admits the air into the cylinder and the suction of the plunger forces the valve (12) from its seat admitting the air freely into the cylinder from which it is forced by the plunger on the downstroke against the valve (13) forcing it out of contact with the seat (13) into the chamber and through the outlet pipes 1010. The continuous reciprocation of the plunger in the cylinder charges the air tank with compressed air. The pressure is indicated by the gage 21. The cut-01f valve (22) prevents the air from flowing into the liquid tank until such time as it is desired to use of and formed between partition walls,

it for the purpose intended.

The liquid tank (23) is of the ordinary con struction. A paddle or bladed agitator 29 is mounted on a vertical shaft (25) which is journaled in the tee (26) with a stuffing box and adapted to be iieciprocated or rotated by the lever (27) for the purpose of agitating the liquid or fine solids to thoroughly commingle the liquid in the tank preparatory to spraying on surfaces of building or other bodies.

A globe valve (28) is secured to a pipe (29), a flexible hose or other apparatus is inserted in the screw threaded free end of the valve to afford a means of controlling and shutting off the liquid flowing from the tank under pressure. The lever (31) and link (32) are pivotally connected to the end (33) of the plunger and operate it in the usual manner. A hopper (34) and valve (35) are secured to the tee (36) to provide means for filling the tank (23).

Having fully described my invention, what I claim and desire to secure by Letters Patent is In a spraying machine, the combination of a vapor compressor with a base having a1r chambers located in the lower portlon therespring actuated puppet valves operating within said air chambers, a cylinder secured to said base, an elongated plunger fitted to reciprocate within said cylinder, means to inject air into said chamber, means to force the air from said cylinder into air and liquid tanks, a vertical shaft projecting into and below the bottom of the liquid tanks, an agitator located in the lower portion of the liquid tank and mounted upon said shaft,

means to impart rotary motion to said agitator. an outlet pipe with a tee fitting secured to the lower portion of the liquid tank forming a journal support for said shaft, a flexible hose or other apparatus secured to the outlet pipe, means to reciprocate the plunger in the cylinder.

Signed at Mansfield, Ohio, this 3 day of February 1906.

ROBERT M JOHNSTON. 

